CHAMPAIGN, Ill. — Researchers analyzed meteorological data from nine Upper Midwest states from 1979-2021, tracking trends in extreme heat and cold over every 4-kilometer square of that territory. They found striking regional differences in the extremes.
Study tracks decades of extreme heat, cold
Many areas saw increases in the frequency of daytime heat stress, while others had decreases in the number of extremely hot days from 2001-2021.





